rails                  
                                          
                                          
  
                                          
  
                                          
                                          
 trains  are  so  constructed  that  they 
 have to  follow a set path. this path is 
 called a  "railway",  which is comprised 
 of two  metal rails, hence its nickname. 
                                          
 because  the low  friction  between  the 
 wheels of the train and  the rail metal, 
 there  are limits  for how acute a curve 
 can be, and  even more so  for how  much 
 the   ground  under  the  rails  can  be 
 sloped. thus a  railway is often not led 
 on  top of hills, rather through them in 
 tunnels  (if   they   are   large),   or 
            artificial chasms.            
                                          
 there will be trees  on the side  of the 
 rails, but  not too  close, or they will 
 be  cut down  by  the  railway janitors. 
 there  will be  plains,  and  bodies  of 
                  water.                  
                                          
 trains  go  by day  and  by night. along 
       the way, there is information      
 scattered, often put  on top  of  poles, 
 to be interpreted  by the train drivers. 
 different  parts  of  the  railway  have 
         different speed limits.          
                                          
 sometimes, trains have  to stop and wait 
 for something  to happen, far away. this 
 is  signaled  by  red or  green  lights. 
                                          
                                  
                                          
 many people follow  the rails  by  foot. 
 often this  proves  to  be  the  shorter 
 path  between  two points. however  this 
 is  frowned  upon,   and  very  impolite 
         toward the train drivers!